elliott



(NoModeL) 2 Sheets-Sh'eet 1.

A. ELLIOTT. ELEVATOR GUARD.

No. 448,605. Patented Mar. 17, 1891.

2 Sheets 2.

' (No Model.)

A. ELLIOTT.

ELEVATOR GUARD.

No. 448,605. Patented Mar. 17, 1891.

ABRAHAM ELLIOTT, OF ROCHESTER, NEXV YORK, ASSIGNOR TO THE FEE BROTHERS, OF SAME PLACE.

ELEVATOR GUARD.

SPECIFICATION forming part of Letters Patent No. 448,605, dated March 1'7, 1891. Application filed May 29, 1890. Serial No. 353,586. (No model.)

To ctZZ whom it may concern.-

Be it known that I, ABRAHAM ELLIOTT, of Rochester, in the county of Monroe and State of New York, have invented a certain new and useful Improvement in Elevator-Guards; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the drawings accom panying this application.

My improvement relates to that class of elcvators in which the door is opened and closed by gearing operated by a shaft independent of the car, so that however rapidlythe car may ru 11 the door receives a slow and uniform motion.

The invention consists in the construction and arrangement of parts hereinafter described and claimed.

In the drawings, Figure l is a front elevation of a portion of the well and the door, the door being shown in the closed position. Fig. 2 is an enlarged vertical crosssection in line or (c of Fig. 1. Fig. 3 is a front elevation of the gearing, looking in the direction of the arrow at the right in Fig. Fig. 4: is an enlarged cross-section of the standard that carries the operatingcam on the car, the line of section being indicated by line 3 g of Fig. 2. Fig. 5 is an enlarged face view of one of the devices on the door for disengaging the gear ing at the end of the sliding movement ofthe door.

A indicates the well, 15 the car, and O the door. The latter may be made solid or in lags Ct a, hinged together, so as'to make the door flexible, in which case it can be run around a cornerof the well without being extended.

D is the shaft by which motion is given to the door by means of the gearing hereinafter described. The shaft runs vertically through all the floors of the building, resting between the doors and the casings of the well, and is driven by a band I) and pulley c, or by any other suitable means. (Z and f are two mitergears made fast to this shaft over each door and revolving with it.

E is a metallic frame attached to the casing above the door, extending out over the latter and provided with two ways h It on opposite sides.

F is a slide, which slides up and down freely in these ways. '1 is a sprocket-wheel, and ka miter-gear attached to a shaft which has its hearings in the slide. The sprocket-wheel is attached on the outer and the gear-wheel on the inner side of the slide and moves up and down with it. The gear 7tengages alternately with the gears (Z andf when the slide is moved up and down, but is out of gear with both when in a central position.

G is a cam on one side of the car for oper' ating the shifting mechanism. It consists of an elliptical spring hinged at its upper end, as shown atj, and free at its lower end, by which means the spring can be drawn back to run free of the slide which it operates. The spring is collapsed by means of a camwheel ll, Fig. 4, having an eccentric-rib e, which strikes a stud Z of a connecting-plate m, that extends back and isjointed centrally to the spring. On the shaft of the cam-wheel is a handle 12, by turning which the spring is drawn back.

I is a sliding rod provided at its outer end with a friction-wheel 0, against which the cam G strikes as the car goes up or down.

K is a crank-arm pivoted to the inner side of the well, to one end of which the sliding rod I is pivoted.

L is a connecting-rod pivoted atone end to the cranloarm K and at the other to a rocklever N, which is centrally pivoted at p to the frame E.

P is a pitman pivoted at one end to the outer end of rock-lever N and at the other to the top of slide F. It will be seen that when the car goes up or down cam G strikes the end of the sliding rod I, pushes the same in, thereby turning crank-arm K, elevating connecting-rod L, tilting the rock-lever N, and consequently throwing the slide F down, so that the center-gear it comes into engagement with the lower fixed gear (Z on the revolving shaft D. When the cam G releases the red I, a counter-weight r, attached to crank-arm K, reverses the parts and draws gear 71; out of engagement with gear cl.

.9 is a sprocket-wheel attached to the casing at the opposite end of the door from the gear ing, and t is a drive-chain connecting the two sprocket-wheels and connected with the top of the door by a link (P, by which means the door is opened and closed.

a is a double-wedge shaped lug attached to the face of slide I standing outward from the same, and It S are two cams attached at 5 opposite ends of the door which cooperate with the lug for stopping the opening and i closing movements of the door. Each of these 1 cams is provided with an inclined head 0', i that strikes the inclined surface of the lug to i operate the slide, also with concaves r r,l, which strike over or under and embrace the lug when fully thrown. The shanks 2/ 11' of the cams are attached to a casting T, Fig. 5,

attached to the door, and are made adj ustable vertically by means of a bolt (t that passes through a slot U of the shank. This adjustment is for the purpose of fitting the cam-heads to strike the lug properly in setting up and adjusting the machine, as the slide 1 is liable to vary somewhat in position,

and this adjustment of the shanks 11' u' is necessary to adapt the parts to bring the center gear 7; in proper relation with the fixed gears (Zf.

The operation is as follows: The door being closed, as shown in Fig. 1, when the car goes up or down, cam G on the car strikes sliding rod I, operates slide I and brings the center gear is into engagement with the lower fixed gear (Z. This runs the door open. At the end of the opening movement the inclined cam R on the door strikes under the lug ll of the slide and raises the gear 7r from gear (Z and stops the movement of the door. The spring G on the car yields sufficiently under the back-pressure of the sliding rod I for this action to take place, as the movement to disengage the gears is very slight. This leaves gear 7. out of engagement with both fixed gears (11". As soonas the car moves out of place sliding red I is released, and the weight '2', acting through the medium of the connecting mechanism, draws upon slide I and raises the center gear is into engagement with the upper fixed gearf. This runs the door closed again. At the end of the closing movement the cam S on the door strikes over the lug r and draws the gears out of engagement and stops the closing movement. At each full throw of the door the concaves 2' r of the cams rest over and embrace the lug and prevent any accidental displace ment of the door. liy simply reversing the position of. the crank-arm K the door can be made to work the other way-that is, it can he run open by the engagement of the gear 7.: with the upper gearf, and run closed by the engagement of said center gear with the lower gear (Z. The devices are thus adapted to both right and left doors.

By the arrangement above described I dispense entirely with a sliding clutch between the gears, which has heretofore been necessary to connect the center gear with the gears on the operating-shaft.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In an elevator-guard, the combination of a revolving shaft, two gears fixedly attached to the shaft, a vertically-movable slide, a center gear attached to the slide and alternately engaging with the fixed gears as the slide is moved up and down, a sprocket-wheel attached to the slide, a second sprocket-Wheel attached to the well over the door, a drivechain running on the sprocket-wheels and connected with the door, a cam attached to the car, and mechanism connec ed with the slide and operated upon by the cam to give vertical movement to the slide, as herein shown and described.

2. The combination of the slide F, provided with the center gear k, the connecting-r0611, rock-lever N, connecting-rod L, crank-arm K, sliding rod 1, and spring-cam G, arranged to operate in the manner and for the purpose specified.

3. The combination of the spring-cam G, pivoted at its top and free at its bottom, the link m, pivoted thereto, and the cam II, provided with an eccentric-rib c, which engages with a stud Z on the link, as shown and described, and for the purpose specified.

t. In an elevator-guard, the combination, with the slide I provided with the lug u, of the cams R and S, attached to the door on opposite sides, and means for vertically adjust-- ing the same for the purpose of adapting them to the position of the lug in setting up the machine, as described.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

ABRAHAM ELLIOT lVitnesses:

ALBERT ARMITAGE, HENRY WALBRUM, Jr. 

